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Physical Sciences Collection - Surveying and Geodesy

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Theodolite

Catalogue number:
1986.0395.11

Inscriptions:
"David White Co. Milwaukee Wis. No. 9049" and "USC&GS No. G362"

Dimensions:
height 10 inches; horizontal circle 9 inches diameter; vertical circle 5.5 inches diameter; telescope 13 inches long

Discussion:

This 9-inch theodolite was made for the United States Coast and Geodetic Survey, and designed for first order triangulation. It dates from the mid-1930s. New, it cost $2,175. The horizontal circle is graduated to degrees, and read by opposite micrometers with drum dials to 30 seconds. The vertical circle is graduated to 10 minutes, and read by opposite verniers and magnifiers to single minutes. The David White Co. was established in 1895, and renamed the David White Instrument Co. in 1956.

Ref: David White Co., Catalog A, 7th edition (Milwaukee, Wisconsin, about 1937), pp. 103-104.

Further Information:

David White
Theodolite

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